> Has anyone ever found any GENIE tapes or backups?
There are two sets of backups from UCB and Shell Development that have been
found. The problem is there are no surviving copies of what was on the
swapping drum, so building a runnable system has proven to be very
difficult.
The contents of the tapes need to have the personal directories expunged
before they can be released.
Unfortunately, the SDS software library that CHM was just given doesn't
contain the system software for the 940. There is one diagnostic tape and a
user utility tape.
>From going through the documentation that came with the library, it looks
like there was very little for the 940 inside SDS as far back as 1971.
This video tests the myth that you can kill a man with a Model M keyboard
and still type on it afterward: http://m.etv.cx/
Cheers,
Bryan
P.S. I have no relationship with this site other then happening to find it
while searching for "RR-Net".
> >I am looking for a DOS program to turn my computer into an answering
> >machine.
There was a dedicated ISA-bus card for the PC called "Watson" that did
exactly that under DOS. It had a character-based user-interface. It
allowed remote access to the voicemail boxes. It could also serve as a
"demon dialer", intercepting touch tone signals to do speed dialing and
other functions. The device had two RJ-11 jacks, one for the phone line
coming into the house, and the other which fed all of the rest of the
phones in the house. It could also, with optional software, be set up
as a basic AVR system. It could also serve as a 1200-baud (IIRC) modem.
I don't recall any FAX capabilities.
I have one of these around somewhere, and even the "voicemail" software
(on 5 1/4" DOS floppies), along with the documentation. I used it for
quite some time on a clone "XT"-class machine utilizing a NEC-made
8088-compatible micrprocessor. It worked pretty well, though the
biggest problem was that there was no indication at the phone that
voicemail was waiting. You either had to check it, or go to the PC to
see if there were messages.
Rick Bensene
The Old Calculator Web Museum
http://oldcalculatormuseum.com
Hi All,
There's been some interest in the kit, so here's the answers to the
questions that I should really have included in the first email... ;)
I would prefer not to have to post anything, so yes, collection is
preferred. I'm in all day most Sundays, and after 18:30 during the week.
Email me for my address and contact details.
The kit is destined for the dump and then landfill if it's not gone my
the end of the month. If you can't get to me before the end of the month
I will keep stuff, but only if you promise to pick it up ASAP. :)
I have also found the following kit to add to the freebie list...
* Wangtek 5150ES SCSI QIC internal tape drive.
* A.N.Other SCSI DDS2 or 3 SCSI internal tape drive (black).
* Grid ruggedised 286 laptop (fully working but no battery, comes with
psu) has hdd of indeterminate size and plasma screen, currently running
MSDOS.
* DEC Alpha 600au workstation (with Tru64 media).
* Sun 17" CRT (13W3 connector and converter to HD15, sony tube).
Re the two cisco 2500 routers, they are a 2501 and 2514. Each comes with
a blue cisco X.21 cable and an AUI to RJ45 converter.
Regards,
Jules.
Hi everybody,
does anybody have documentation for the RA9x drives, which goes beyond the user's guide ?
A friend of mine has several drives which are faulty and display the type of error with an error code in
the display. Unfortunately, the user's guide, which can be found online, doesn't reveal all these codes. Maybe there is a sort of maintenance guide somewhere ?
I don't even know, if DEC ever published schematics of these drives, as they appeared on the market in the very early '90s... can anybody confirm that or do schematics exist somewhere?
I'm personaly interested, too, as I'm running a SA800 and some additional stand-alone RA92 drives. So far, they have been fine, but this can change any time...
Kind regards,
Pierre
_______________________________________________________________________
Viren-Scan f?r Ihren PC! Jetzt f?r jeden. Sofort, online und kostenlos.
Gleich testen! http://www.pc-sicherheit.web.de/freescan/?mc=022222
Still can't find manuals. But here's what I know and maybe people can fill
in the blanks.
First info - Base model is 45711E, supposedly that designates 110+, 512k
ram, & modem. The memory drawer has a model 82981A, which googling suggests
is 128k ram addon. There's a metal shield over the chips and I don't have
the right torq bit to remove. Upon boot all the ROM ID shows BBBBBB.
First question - going into system config lets me set the memory split
between main memory and edisk. All choices add up to 896k. How does that
square with 128k + 512k?
Second info - The PAM menu shows the following application choices - DOS
CMDS, HP reflection, VT reflection, Memo Maker, Time Management, and BASIC.
However, opening up the software drawer shows the following chips in the
following locations 82863K-Reflection1 (0L), 45504K-MemoMaker/TimeMgt (1L),
82862K-BASIC (4L), 45555K-1/2-ExecutiveCardMgr (5H),
45555K-2/2-ExecutiveCardMgr (5L), 45548K-1/2-Lotus123 (6H),
45548K-2/2-Lotus123 (6L).
Second question - I assume the PAM menu selections for HP reflection and VT
reflection are handled by the single 82863K rom. I am curious why the
Executive Card Manager and Lotus123 don't show up in the PAM menu?
Misc. questions - The built in battery is obviously dead and won't hold a
charge, as the unit won't run at all without the AC adapter. Every time I
boot up though, it asks to reformat the A drive due to memory loss. More
importantly, it has lost the date/time and system config settings
(memory/edisk split for example). I'm curious if the date/time and config
settings are kept by a different battery I may need to replace, or if all of
the above is maintained by the single battery. I will have to hunt up a new
battery.
This 110+ is a really nice box! I'm quite fascinated by the built-into-rom
HP terminal emulator (dumb terminal emulation won't do) as well as VT
terminal emulator and serial port, all in a small package! Sweet!
Thanks for any pointers!
Jay West
> I was able to get copies of the Tandy 2000
> manuals for what is
> going to be a pretty challenging emulation project that I've
> undertaken.
> Since I don't have a 2000 system I was wondering if someone
> on the list who
> has one would be able to make copies of the BIOS ROMs from
> their machine.
> The BIOS/boot software is contained in two ROMs at locations
> U47 and U48.
> U47 is the "odd" rom and U48 is the "even" rom.
>
>
>
> Thanks again.
Rich:
I have a running 2000 here, that I can transfer files from. The 2000 does not have a BIOS like a PC. I believe the internal ROMs are just a POST and a boot strap, and the rest of the PC like BIOS is on the MS-DOS boot disk. I have been relayed this information by someone that used to develop and debug the 2000 for Tandy/Radio Shack.
Do you know a way to dump them? I guess if I knew their starting address and length I could use debug. I also have Microsoft's Assembler for the 2000.
Kelly
PS I still owe you a phone call about the 2000s. I have one that I don't need, but it doesn't work. My suspicion is the power supply, but I've taken no time to verify this. This unit includes keyboard, HD controller, 10 meg drive and one or two 720k floppies, depending on the unit.
All:
I was able to get copies of the Tandy 2000 manuals for what is
going to be a pretty challenging emulation project that I've undertaken.
Since I don't have a 2000 system I was wondering if someone on the list who
has one would be able to make copies of the BIOS ROMs from their machine.
The BIOS/boot software is contained in two ROMs at locations U47 and U48.
U47 is the "odd" rom and U48 is the "even" rom.
Thanks again.
Rich
Rich Cini
Collector of classic computers
Lead engineer, Altair32 Emulator
Web site: <http://highgate.comm.sfu.ca/~rcini/classiccmp/>
http://highgate.comm.sfu.ca/~rcini/classiccmp/
Web site: http://www.altair32.com/
/***************************************************/
I'm trying to organize my PDP11 setup in a neat and tidy fashion, and I'm
wondering, aside from the DEC transition panels which would be ideal, what
sort of multi medium transition panels are there that I can attach things
like multiple RS232 ports and SCSI connectors, etc to?
The idea I'm after is something akin to the keystone patch panels, but with
things like full RS232-DB25 that just attach with a plate or something, much
like the DEC panels. Anyone seen anything like this?
> -----Original Message-----
> From: cctalk-bounces at classiccmp.org
> [mailto:cctalk-bounces at classiccmp.org]On Behalf Of Mark Firestone
> Sent: Thursday, October 12, 2006 7:05 PM
> To: On-Topic and Off-Topic Posts
> Subject: Oregon Software Pascal/2
>
>
> Anyone know what happened to Oregon Software.... or where to find
> Pascal/2 for RSTS/E. I want it for my PDP emulator...
> because it is the
> language I learned to program with.
>
> None of that String bollox, real men use Array[1.80] of Char;
I have it for Xenix on the TRS-80 model 16, but I don't think that helps much.
Kelly
Hi All,
I'm afraid that I no longer have the room to keep either my DEC VAX
4000/705A or my DEC AlphaServer 2000. Both are in working condition.
Please note that the Vax is DSSI, not SCSI and has no disks, but does
netboot NetBSD/VAX nicely. It also has an internal DSSI DLT (unknown
condition as I have no tapes).
====
Hardware specs
====
VAX 4000/705A (aka Legacy+)
NVAX CPU (45 VUPS), 256Mb RAM, DSSI, no disks. Running NetBSD/VAX 1.5
ALPHA SERVER 2000 (aka Sable)
Dual 21064 200MHz CPUs, 196Mb RAM, SCSI RAID, 6x 4Gb HDD. Running Tru64
5.x
====
Both machines come from when I used to work at Racal. The Alpha comes
with media and documentation. The VAX doesn't.
I also have a couple of cisco 2500 routers up for grabs too.
Thanks,
Jules.
P.S. my "nospam" email address is real...
> From: woodelf <bfranchuk at jetnet.ab.ca>
> I think the thing that killed BCD computers is thae lack of
> BCD memory addressing.
Some BCD computers had BCD memory addressing.
Also BCD instructions, though full binary data for
masking.
Roger Holmes
In a plastic bag at a local thrift I found a Tomy TP1103 blue/white
controller, but I can not find anything on using google. Anyone know what
system(s) this model works with? Thanks in advance for your help.
I've assembled a basic PDP-11/53ish machine from parts. The CPU is
>from a DECserver 550, converted back into an 11/53 by EPROM swaps.
It has an RQDX3 and cable management board, and a Seagate ST-251
(40 MB MFM) drive. This is all installed in a BA213.
So far, I haven't managed to get a load device working. I have an
RX50, but it seems unwilling to work. I'm trying to format the disk.
Jonathan Engdahl describes a trick to bootstrap XXDP utilities using
vtserver:
http://home.alltel.net/engdahl/xxdp.htm
Vtserver does its magic, ODT-ing in the loader, and transferring the
modified ZRQCH0 binary (from XXDP 2.5). At this point, the machine
seems to hang:
@p
Opened xboot.dd read-write
rrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr EOF2
45Boot from vt(0,0,0) at 0177560
: vt(0,0,1)
Opened ZRQCH0 read-write
rrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr EOF2
Boot: bootdev=06401 bootcsr=0177560
I have to cycle power to regain control.
Help please. Has anyone else ever tried this? Thanks,
De
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=190038705808
I'm actually quite interested in it, but it would be a bit of a trek to
pick it up. Is there anyone down there that wants this, or better still
collect it and bring it about half-way up the UK so I can meet them?
Gordon (with not enough weekends and evenings to drive the length of the
country, sadly).
On Oct 13, 2006, at 2:32 PM, woodelf wrote:
> So how many people have a working 24 bit computer on *this* list
> at home or in storage? I may end up building a 24/12 bit design
> ( the PCB layout and hardware design is my problem ) but designing
> a schematic is not.
I unfortunately don't have it (I had a chance, but didn't have a place
to put it), but in high school, the school had a 24-bit computer.
Quite an interesting machine. It used 8K-word magnetic drum memory.
There were two complete redundant CPUs, each with their own 8K drum.
There was a "shared register" between the two machines that could be
used for inter-CPU communication. The machines also shared a very
interesting
I/O system that was housed in a large cabinet. The I/O system consisted
of a Current Loop interface for an ASR-33 teletype (as well as paper
tape reader control), an interface for a wide-carriage IBM output
typewriter (individual typebars, not a Selectric-style device), and a
large number of digital input and output ports, a number of programmable
counters (to be used as interval timers), along with a bunch of A/D and
D/A channels.
There was also a BCD real-time clock which kept track of the time of day
in hours/minutes/seconds, and also toggled a bank of flip flops at
various rates which could be polled (no interrupts existed on the
machine) to track time in various increments (1/2, 1/4, 1/8 and 1/16-th
second intervals, if I remember correctly). There was also a set of
thumbwheel numeric input switches which could be read, which, if I
recall correctly, was 6 digits long, BCD encoded. The machine was all
transistorized. No ICs anywhere.
The machine was made by 3M Corp. (Minnesota Mining & Manufacturing). It
was a process control machine. Its original use was as a natural gas
pipeline pressure monitoring and control system by Northwest Natural Gas
Co. in Portland, Oregon. After it was retired, it was donated to our
high school.
When I started at the high school, one of the drums had failed, so one
CPU was inoperative. But, the other worked well.
It was a two address machine, with operand address, and next instruction
address. Addresses were of the form block/track/sector as the drum was
organized. The instruction set was pretty simple, there were five bits
in the opcode. There was an accumulator (24 bits), and a "B" register
which could be used for temporary storage. The accumulator and B
register were discrete registers, not located on the drum. Master
timing for the machine was generated by a pre-written clock track on the
drum, so all operations of the machine were synchronized with the drum
rotation. Some kind of phase locked loop or the like was used to keep
the drum rotating at a consistent speed (I think it was 3,600 RPM). The
instruction set documentation had a "for optimum programming" section
for each instruction, which provided formulas for the operand address
and next instruction address to minimize the access time for the
instruction. Typically, the operand address was the current address +
3, and the next instruction address was the current address + 6. Using
these formulas would mean that the operand would be under the head after
the instruction was fetched and decoded, and the next instruction would
be under the head when the operation was completed.
There were no index registers or base registers or anything like that.
Addressing tables and such had to be performed by instruction
modification, e.g., load an instruction into the accumulator, increment
(or add 3 for optimum programming) to the operand address, store the
accumulator back over the top of the instruction, then execute the
modified instruction. Made list processing, stacks, and the like rather
tedious.
Each CPU was in a "drawer" about 8 to 10 rack units high. The drum was
located in the center of the chassis, with circuit boards (which, IIRC,
were about 7" long, and 5" wide) plugged into a backplane in the shape
of a "U" around the drum. The two CPUs mounted in a small rack one atop
the other.
Controls for the CPU were simple. STOP, START, CLEAR, and LOAD. Clear
cleared all of the working registers, and set the program counter to
Block 0/Track 0/Sector 0, and halted the machine. Stop halted the
computer after the execution of the current instruction was completed.
START began program execution. LOAD put the machine into a hardwired
loader that would allow address/data pairs to be loaded into the drum
>from the paper tape reader on the ASR-33. The address and data were
expected in octal, with a space separating the address and the data.
These controls were momentary pushbuttons, with the START, STOP, and
LOAD buttons lit to indicate when the machine was running, halted, or in
LOAD mode. Five indicators would show the opcode of the current
instruction. I seem to recall that it was possible to
single-instruction step the machine by putting the machine into STOP
mode, then holding the STOP button down when pressing the RUN button at
the same time, but this memory could be incorrect.
There was a two-pass assembler called SOAP that could be loaded from
tape, then the source run through the paper tape reader twice, with the
resulting object code stored on the drum. SOAP was pretty big, though,
about 4K resident, which meant that you couldn't write anything much
larger than about 4K in size with the assembler.
I had spent time at the Oregon Museum of Science and Industry (OMSI) on
their "Straight 8" PDP-8 System, and had learned FOCAL. I decided to
try to write FOCAL on the 3M machine. I actually got to it to the point
where small programs could be entered, edited, and executed. It did
integer math only (24 bit), as floating point simply wouldn't have fit.
When a line of code was entered, and the RETURN key hit, it would take
about 1.5 seconds for the line to be parsed, error checked, and stored.
This machine was not very fast. I wrote quite a few programs for this
machine, including a blackjack game, tic tac toe, an alarm clock (you'd
enter the time on the thumbwheel switches, and when the time came along,
the teletype would ring the bell).
Never got the IBM output typewriter working. It had mechanical problems
(probably needed a thorough cleaning and lubrication). After I
graduated from high school, the machine didn't get much attention.
Someone tried powering it up at one point, and the drum in the still
operating CPU failed..bearings went bad, and (fixed) heads crashed. The
school eventually moved to a new building two years after I graduated,
and that's when I had the opportunity to take the machine, but I had no
place to put it, nor any way to move it. It was rather large (and
heavy).
The cabinetry was all painted a dark blue color. A white formica table
top sat on top of the two CPUs in their small rack, and on top was a
console with the real-time clock (using incandescent displays that had a
GE-47-style lamp that shined through a piece of film that had the digit
on it, which projected the digit on the a satin-finish plastic display
screen). The clock was not made by 3M, but by someone else, was about 6
rack units high, and had pushbuttons to manually advance the hours,
minutes, and seconds. It was implemented with transistor logic,
connected as ring counters for each digit. Also on this panel was the
six-digit thumbwheel numeric entry device.
The IBM typewriter sat to the right of this panel. The controls for the
CPUs were mounted on the front plate of each CPU drawer. To the left of
the CPU drawers was the large cabinet that housed all of the I/O
circuitry. It was crammed full of transistorized modules that plugged
into a massive backplane.
Each CPU had its own power supply, as well as the I/O cabinet, and the
realtime clock. Each CPU needed a 20A 110V circuit. The I/O cabinet
needed a 30A 110V circuit. The clock, IBM typewriter, and Teletype had
their own 20A 110V circuit.
I've been unable to remember the model number of this machine. I recall
that it was 4 digits long. At one time, I had a big binder which
contained a bunch of documentation for the machine, including the
instruction set information, some information about the I/O subsystem
programming, and also complete schematics for the CPU. I've searched
and searched for it, and can't find it -- so I think that it must have
been lost or accidentally tossed in one of many moves.
I've searched high and low on the web looking for any references of any
computers made by 3M, and have found nothing. My guess is that they
didn't made computers for a very long period of time. My recollection
is that the date on the documentation was 1965, but not sure of this.
Anyway, probably a whole lot more here than anyone cares about, but it
is my hope that perhaps someone out there may recall a machine like this
made by 3M.
Sure had a lot of fun playing with that machine. Learned a great deal
>from it. The mainstay computing at our highschool was an HP timeshare
system (initially, HP 2000C, advancing over the years to a 2000C',
2000F, then 2000/Access) which were accessed by dial-up ASR-33
teletypes. A "closed" BASIC environment, which was great, but no
machine-level programming. I learned a great deal about "how computers
work" from the old 3M machine.
Thanks for letting me spew out all these memories.
Rick Bensene
The Old Calculator Web Museum
http://oldcalculatormuseum.com
Hey folks. Does anyone have a Ferguson Big Board that they might
be interested in unloading? I drooled over their ads in BYTE when I
was a kid; I'd love to have one now. I have a pair of 8" drives
sitting here just waiting for one.
-Dave
--
Dave McGuire
Cape Coral, FL
I have a PDP-11/23 for sale with the following componets in three 4-
foot racks:
Pictures: http://www.schnitz.com/pdp/
Rack 1:
RL02
PDP-11/23
RL-02
The stuff sitting in front of the rack isn't related.
Rack 2:
Colorado Video Digitizer
Chroma Keyer Decoder Model 4706
Bosch unit
Another video-related piece of equipment below that
There's some wire-wrapped board sitting it the empty space below
that. I'm not sure if it's a part of the system, or if I just stuck
it there to save space. i'll pull it out tomorrow and take a look.
Rack 3:
Memory (possibly some other stuff mixed in there too, but the black
units are primarily memory)
Power Supply
Fan
Also included:
Cabinet of RL02 cartridges. I recall at least one of the tapes was
labeled "System" and something else. I can write down what they're
all labeled, if it makesa difference to anybody.)
Very large drawing tablet
The fellow I bought this from told me it was used to do computer-
generated graphics in the '70s and that it cost his company a quarter
million dollars. I think it's depreciated since then. I bought it
several years ago, but never did anything with it. It sat in his
basement, then it sat in my garage. He told me it was working when
decommissioned, but that was some time ago and it's utterly as-is.
He also said it uses the same memory (behind the black panels) as in
the Apple II.
I bought a milling machine last week and need the room, so I'd like
to see it go relatively soon. I'm in York, PA.
I also picked up some HP-85B's at an auction last week. I only
wanted two, so the rest are for sale. They came out of storage at a
very nice lab and look like they're in great shape.
Also available from the same auction is a system configured as follows:
HP 9144 (tape drive)
HP 7957B (hard drive)
HP A-Series Controller 3065ST (board tester?)
Make offer.
Tom
--
Apple I Replica Creation: Back to the Garage
By Tom Owad, Foreword by Steve Wozniak
About the book: <www.applefritter.com/replica>
OSNews Review: <www.osnews.com/story.php?news_id=10085>
I'd like to echo Henk's thanks for the discussion. I too am learning
>from this as I'm actively working on a /34a and looking at a dormant
/70.
Interestingly the /70 has an M9312 in 1AB _before_ any of the
processor boards and an M9302 (as expected) at the end of the Unibus.
Thanks,
John
>
>Subject: Re: Tandy 2000 Floppy Drive Replacement
> From: Fred Cisin <cisin at xenosoft.com>
> Date: Sat, 14 Oct 2006 13:56:14 -0700 (PDT)
> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
>
>> On Fri, 13 Oct 2006, Fred Cisin wrote:
>> > The Tandy 2000 uses a 720K 5.25" drive. DSDD 96tpi.
>> > Matsushita (Panasonic, Shugart, etc.) 465
>> > Tandon TM100-4
>> > Teac 55F
>> > etc.
>> > SOME 1.2M drive could work. They need to be jumpered to 300 RPM, "low
>> > density" recording current, etc.
TEAC FD55GFV jumpered for fixed speed.
>>
>On Fri, 13 Oct 2006, Marvin Johnston wrote:
>> Second, IIRC the speed and "low density" recording current are set with jumpers.
>> What is the etc.?
>
>Ready v Disk change (pin 34)
>termination
>drive select
>maybe motor on w/drive select
>
>> I might add that when connecting a standard 360K drive, the light comes on and
>> stays on, and the drive continues to spin when a disk is inserted. This gives me
>> the impression that there may be something wrong with the disk controller for
>> the Tandy 2000. The cables for the 2000 are straight-thru, so I rejumpered the
>> drive to the first drive (D0 of 0-3 or D1 of 1-4.) And yes, I checked and double
>> checked to make sure that pin 1 on the motherboard matches pin 1 on the drive!
Connector on drive upside down. Drive runs on power up with light lit, doesnt
step (may recal on power up depending on drive). NOTE: if the connector is
inverted any media inserted is erased for whatever track the head sits at
(write enable is active).
>DECMATE II Soft-Sect. CP/M
DECMATEII (and III) was a RX50 (SSDD 80tr) ~400k
Though one later option was RD31(st225 20mb) or RD32 (ST251 40mb)
hard disk with RX33 (FD55GFV). DECmateII treated the FD55GFV as
a single platter RX50 (single sided) unless teh firmware
was above a certain rev. DECmateIII knew RX33.
>DEC Rainbow
Most DEC machines prior to VAXmate used RX50 a dual
drive of 80tracks single sided and about 400k each.
>DEC Rainbow MS-DOS V2.05
Again, RX50 though RX33<teac FD55gfv> could be fitted.
RX50 remained the "Corperate" floppy drive till VAXmate.
There were a few products that used otehr drives but
usually from the start. For example Robin (VT180) used
either SA400L or TM100s (40 track single sided DD).
Allison
While doing some moving today of items to storage I found that Power
Macintosh G3 (Blue and White) tower
(family M5183) had both support feet broken. Does anyone have a extra set of
these, that they are willing give or sell real cheap? Email me off list
please. Thanks John
Sounds like you have the Floppy Cable backwards.
Try plugging it in the other way around.
You have Pin 1 and pin 40 flipped. A constant light and spinning motor is the usual symptom of that.
Another way to get data off that machine is to use LapLink V and a Serial LapLink Cable. There were several work-alikes to LapLink like FastMove and others.
You should be able to buy LapLink cables rather cheaply these days.
Al
Phila, PA
----Original Message-----
From: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org]
On Behalf Of Marvin Johnston
Sent: Friday, October 13, 2006 8:46 PM
To: ClassicCmp
Subject: Re: Tandy 2000 Floppy Drive Replacement
On Fri, 13 Oct 2006, Fred Ciscin wrote:
> The Tandy 2000 uses a 720K 5.25" drive. DSDD 96tpi.
> Matsushita (Panasonic, Shugart, etc.) 465
> Tandon TM100-4
> Teac 55F
> etc.
>
> SOME 1.2M drive could work. They need to be jumpered to 300 RPM, "low
> density" recording current, etc.
First, what other machines used a 5 1/4" 720K drive? I've been looking
through
the stash, and so far I haven't found anything.
Second, IIRC the speed and "low density" recording current are set with
jumpers.
What is the etc.?
I might add that when connecting a standard 360K drive, the light comes on
and
stays on, and the drive continues to spin when a disk is inserted. This
gives me
the impression that there may be something wrong with the disk controller
for
the Tandy 2000. The cables for the 2000 are straight-thru, so I rejumpered
the
drive to the first drive (D0 of 0-3 or D1 of 1-4.) And yes, I checked and
double
checked to make sure that pin 1 on the motherboard matches pin 1 on the
drive!
Thanks!
On Fri, 13 Oct 2006, Fred Ciscin wrote:
> The Tandy 2000 uses a 720K 5.25" drive. DSDD 96tpi.
> Matsushita (Panasonic, Shugart, etc.) 465
> Tandon TM100-4
> Teac 55F
> etc.
>
> SOME 1.2M drive could work. They need to be jumpered to 300 RPM, "low
> density" recording current, etc.
First, what other machines used a 5 1/4" 720K drive? I've been looking through
the stash, and so far I haven't found anything.
Second, IIRC the speed and "low density" recording current are set with jumpers.
What is the etc.?
I might add that when connecting a standard 360K drive, the light comes on and
stays on, and the drive continues to spin when a disk is inserted. This gives me
the impression that there may be something wrong with the disk controller for
the Tandy 2000. The cables for the 2000 are straight-thru, so I rejumpered the
drive to the first drive (D0 of 0-3 or D1 of 1-4.) And yes, I checked and double
checked to make sure that pin 1 on the motherboard matches pin 1 on the drive!
Thanks!
